Computer Science
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.133..129r&link_type=abstract
Earth and Planetary Science Letters, vol. 133, Issue 1-2, pp.129-143
Computer Science
12
Scientific paper
Particle reactive elements are scavenged to a higher degree at ocean margins than in the open ocean due to higher fluxes of biogenic and terrigenous particles. In order to determine the influence of these processes on the depositional fluxes of 10 Be and barium we have performed high-resolution measurements on sediment core GeoB 1008-3 from the Congo Fan. Because the core is dominated by terrigenous matter supplied by the Congo River, it has a high average mass accumulation rate of 6.5 cm/kyr. Biogenic 10 Be and Ba concentrations were calculated from total concentrations by subtracting the terrigenous components of 10 Be and Ba, which are assumed to be proportional to the flux of Al 2 O 3 . The mean weight ratio of the terrigenous component was determined to be 0.0045. The unusually high terrigenous 10 Be concentrations of 9.1 × 10 9 atoms/g Al 2 O 3 are either due to input of particles with high 10 Be content by the Congo River or due to scavenging of oceanic 10 Be by riverine particles. The maxima of biogenic 10 Be and Ba concentrations coincide with maxima of the paleoproductivity rates. Time series analysis of the 10 Be and of Ba concentration profiles reveals a strong dominance of the precessional period of 24 kyr, which also controls the rates of paleoproductivity in this core. During the maxima of productivity the flux of biogenic Ba is enhanced to a larger extent than that of biogenic 10 Be. Applying a model for coastal scavenging, we ascribe the observed higher sensitivity of Ba to biogenic particle fluxes to the fact that the ocean residence time of Ba is approximately 10 times longer than that of 10 Be.
Bonani George
Dittrich-Hannen Beate
Kubik Peter W.
Mangini Augusto
Rutsch H.-J.
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